ABSTRACT
This chapter explains the internal resistance of voltage source and describes sketch the 'equivalent circuit' of a voltage source. It outlines the experimental method of determining the internal resistance of a cell and explores solve simple problems on the effects of a voltage-source's internal resistance. The load current supplied by any voltage source, whether it be a cell or battery, a generator, or a transformer, as well as passing through the load must, of course, also pass through the voltage source itself. A voltage source's open-circuit, or no-load, voltage corresponds to its electromotive force. The voltage appearing across the voltage source's terminals under this condition is called its open-circuit voltage or no-load voltage – which exactly equals the electromotive force of that source. The chapter also outlines the experimental method of determining the internal resistance of a cell and also describes solve simple problems on the effects of a voltage-source's internal resistance.
